Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Study on Reaction Behavior of Mg-FeB Phase for Rare Earth Elements Recovery from End-of-life Magnet

  • Sangmin Park (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Dae-Kyeom Kim (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Rongyu Liu (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Jaeyun Jeong (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Taek-Soo Kim (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Myungsuk Song (Korea Institute for Rare Metals, Korea Institute of Industrial Technology)
  • Received : 2023.04.12
  • Accepted : 2023.04.23
  • Published : 2023.04.28
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Abstract

Liquid metal extraction (LME), a pyrometallurgical recycling method, is popular owing to its negligible environmental impact. LME mainly targets rare-earth permanent magnets having several rare-earth elements. Mg is used as a solvent metal for LME because of its selective and eminent reactivity with rare-earth elements in magnets. Several studies concerning the formation of Dy-Fe intermetallic compounds and their effects on LME using Mg exist. However, methods for reducing these compounds are unavailable. Fe reacts more strongly with B than with Dy; B addition can be a reducing method for Dy-Fe intermetallic compounds owing to the formation of Fe2B, which takes Fe from Dy-Fe intermetallic compounds. The FeB alloy is an adequate additive for the decomposition of Fe2B. To accomplish the former process, Mg must convey B to a permanent magnet during the decomposition of the FeB alloy. Here, the effect of Mg on the transfer of B from FeB to permanent magnet is observed through microstructural and phase analyses. Through microstructural and phase analysis, it is confirmed that FeB is converted to Fe2B upon B transfer, owing to Mg. Finally, the transfer effect of Mg is confirmed, and the possibility of reducing Dy-Fe intermetallic compounds during LME is suggested.

Keywords

Acknowledgement

This work was supported by Korea Institute of Industrial Technology as "International cooperation on the development of metallic compounds separation/recovery and byproducts materialization for total recycling during eco-friendly process" project (No. kitech JE-230013) and "Based on the utilization of waste resources, the high-added value and development of rare earth metal recovery technology through pyrometallurgical extraction for ecosystem conversion" project (No. kitech UR230006) and supported UST Young Scientist+ Research Program 2022 through the University of Science and Technology (No. 2022YS28).

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